CONTINGENCIES AND COMMITMENTS - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) acrefoot entity $ / acrefoot	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Long-term purchase commitments - other disclosures
Contingency loss recognized liability	$ 2,400
Purchased water	$ 241,201	$ 223,833	$ 224,529
Operating lease renewal term	25 years
Finance lease renewal term	25 years
Minimum
Long-term purchase commitments - other disclosures
Operating lease term	1 year
Finance lease term	1 year
Maximum
Long-term purchase commitments - other disclosures
Operating lease term	50 years
Finance lease term	50 years
Supply Commitment | Camino Real
Long-term purchase commitments - other disclosures
Payments for other commitments	$ 43,800	43,800	21,500
Additional payments for other commitments		22,300
Kern County Water Agency (Agency)
Long-term purchase commitments - other disclosures
Total capital facilities charge and treated water charge obligation per acre foot | $ / acrefoot	624.27
Portion of estimated operating cost per acre foot for treated water delivered | $ / acrefoot	105.49
Santa Clara Valley Water District
Long-term purchase commitments - other disclosures
Payments to suppliers	$ 15,200	12,600	11,300
Stockton East Water District (SEWD)
Long-term purchase commitments - other disclosures
Payments to suppliers	$ 14,300	$ 11,500	$ 15,300
Kern County Water Agency (Agency)
Long-term purchase commitments - other disclosures
Minimum acre feet of treated water to be purchased per year over life of contract | acrefoot	20,500
Minimum acre feet of treated water to be purchased under prior agreement | acrefoot	11,500
Number of other parties obligated to purchase treated water | entity	3
Minimum acre feet of treated water to be purchased per year by other parties | acrefoot	32,500
Recorded unconditional purchase obligation	$ 82,400
Purchased water	12,800
Water production costs	$ 4,400
Kern County Water Agency (Agency) | Guarantee Type, Other
Long-term purchase commitments - other disclosures
Unrecorded unconditional purchase obligation, minimum quantity required | acrefoot	20,500